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kernel6.6_fix.md

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Potential GPIO Fix - 4/13/2024 - In Testing

  1. First let's fix the python module. This will replace RPi.GPIO with a newer module that uses the same commands.

    sudo apt update && sudo apt install python3-rpi-lgpio  --auto-remove --purge -y

  2. Next We need to fix the issue of pins not showing in /sys/class/gpio. We will use the 'sysfs-gpio-shim' by info-beamer https://github.com/info-beamer/sysfs-gpio-shim.

  3. This is going to require building libgpiod2.1. Lets do that first.

    cd ~
sudo apt install autoconf-archive -y
git clone https://github.com/brgl/libgpiod.git
cd libgpiod
./autogen.sh
make
sudo make install

  4. Next let's install the required libraries to compile sysfs-gpio-shim. We aren't going to compile just yet, we needed to build libgpiod and install libfuse3-dev before updating the kernel to 6.6.

    sudo apt install libfuse3-dev

  5. Update the kernel to 6.6

    sudo rpi-update
sudo reboot

  6. Finally, it is time to build sysfs-gpio-shim

    sudo remount
cd ~
git clone https://github.com/info-beamer/sysfs-gpio-shim.git
cd sysfs-gpio-shim
git checkout ac2faee
make

  7. Go to the /home/pi directory, and create a new script file

cd ~
nano kernel_gpio_fix.sh

  1. Paste the following into that file and save it.

    cd /home/pi/sysfs-gpio-shim
GPIO_GID="$(cut -d: -f3 < <(getent group gpio))"
sudo ./sysfs-gpio-shim -o default_permissions,allow_other,gid=$GPIO_GID /sys/class/gpio
echo 12 > /sys/class/gpio/export
echo 16 > /sys/class/gpio/export

    Make i execuable

    chmod +x kernel_gpio_fix.sh

  2. Place it in rc.local so it runs as boot

sudo nano /etc/rc.local

  1. Look for the line near the top starting with rfkill Right below that line, add a new line with the following bash /home/pi/kernel_gpio_fix.sh

  2. Now we need to edit direwatch.py in a few places. Let's start with making a backup of our work.

cd ~
cp direwatch.py direwatch.py.bak -v
nano direwatch.py

  1. croll down until you find the imports. Put a # in front of import LED, then add import RPi.GPIO as GPIO to the bottom of the list below import numpy.

  2. Scroll down a bit more until you find def bluetooth_connection_poll_thread():. In that function, remove the # in front of each line starting with GPIO (4 places) and add a # in front of each line starting with blue_led (3 places)

  3. reboot the system sudo reboot

Bob's Your Uncle! The GPIO pins should be fixed for kernel 6.6.